The result, birdwatchers fear, is that again this year the birds failed to raise young.

Mark Mills, wildlife biologist for the Michigan Department of Natural Resources, said the nesting box installed in April on the 13th floor of the 5th/3rd building downtown Kalamazoo will remain in place. Volunteers had hoped the birds would like that location better than last year's, when the birdhouse was placed on the roof of the building.

In non-urban settings, falcons like to nest on cliffs, and the hope was that the ledge location would simulate that and that birds would use it.

That may be the case if birds have this year to check out the box before they mate again.

"It looks like we have to hope for nest box use next year," said Audubon Society of Kalamazoo head Russ Schipper.

Peregrine falcons are birds of prey and they like to eat pigeons that live in urban settings.